Wednesday, November 12, 2014


If you find that grub-mkrescue -o os.ios is not working ... install xorriso

Tuesday, November 11, 2014

Good HTML5 video

The guy talks about reading and writing files in JS.

Also - mentioned indexdb - which is the persistence solution for webapp

CORS - cross origin resource sharing
EasyXDM  - cross domain messaging  - uses iframe

Sunday, November 9, 2014

Creating a bootable HD image using grub

It is nicely documented here -

#!/bin/sh -x

dd if=/dev/zero of=out.img seek=8MB count=1k bs=1

outlo=`sudo losetup -f --show out.img`

parted -s ${outlo} mklabel msdos

parted  ${outlo} mkpart primary ext2 32k 100% -a minimal

parted ${outlo} set 1 boot on

partx -a ${outlo}

mke2fs ${outlo}p1

mkdir -p /mnt/out

mount -t ext2 ${outlo}p1 /mnt/out

grub-install --boot-directory=/mnt/out/boot/ --modules="ext2 part_msdos" ${outlo}


umount /mnt/out
partx -d ${outlo}p1
losetup -d ${outlo}

Friday, November 7, 2014

Starting a network service on Ubuntu 14.04 at boot

I run an Ubuntu 14.04 VM on my Mac Mini with Yosemite. For some reason I cant get "bridged" network to work so I have to stick to NAT. What I needed was for the VM to start a Remote Port forwarding onto the host Mac at boot - so that I could simply use ssh to log into my VM. I needed answers to the following questions for this -

1. How do I get my networking to start at boot?
I am not sure of this I had to do this - add
auto eth0
iface eth0 inet dhcp

into /etc/network/interfaces

2. Add a cron job to ssh into my mac -


x=`ps -Aef |grep 2222:localhost:22  | grep -v grep`


if [ "$x" = "" ]
echo "Started the service" > $logfile
date >> $logfile 
ssh -N -i /home/kashyap/.ssh/id_rsa -R 2222:localhost:22 &
echo "Service already running" > $logfile
echo "$x" >> $logfile
date >> $logfile

Tuesday, November 4, 2014

Sonic Pi

A nice program for Raspberry Pi- works on regular machines to -

A nice video introduction by the creator -

Sam talks about a couple of things here -

1. Why's programming guide to Ruby - I think it is this -

2. live_loop :loop_name do

3. Examples in sonic pi are cool